By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., President of the Leland Stanford Junior University, and VERNON L. KELLOGG, M. S., Professor in Leland Stanford Junior University. 12mo. Cloth, $1.20. _Now ready._ _Not a book for learning the classification, anatomy, and nomenclature of animals, but to show how animals reached their present development, the effects of environment, their place in Nature, their relations to one another and to the human race. Designed for one-half year’s work in high schools. Send for sample pages._ ANIMAL FORMS: A Second Book of Zoology. By DAVID S. JORDAN, M. S., M. D., Ph. D., LL. D., and HAROLD HEATH, Ph. D., Professor in Leland Stanford Junior University. _Ready in February, 1901._ =D. APPLETON AND COMPANY, Publishers=, _New York_, _Chicago_, _London_. RECENT SCIENTIFIC WORKS In =Astronomy=, Dr. Simon Newcomb’s new book, published October, 1900; in =Physics=, the Johns Hopkins text of Professors Rowland and Ames; also in Physics for second and third year high school work, the text of Dr. Hoadley, of Swathmore; in =Physiology=, the text by Drs. Macy and Norris, based on the Nervous System; also the =High School Physiology= indorsed by the W. C. T. U., written by Dr. Hewes, of Harvard University; in =Geology=, the =Revised= “=Compend=” of Dr. Le Conte, and the two standard works of Dana,—The =Manual for University Work=, and the =New Text Book=, revision and rewriting of Dr. Rice, for fourth year high school work; in =Chemistry=, the approved =Storer and Lindsay=, recommended for secondary schools by the leading colleges; in =Zoology=, the =Laboratory Manual= of Dr. Needham, of Cornell; and the Series “=Scientific Memoirs=” edited by Dr. Ames, of Johns Hopkins. Nine volumes ready. The publishers cordially invite correspondence. AMERICAN BOOK COMPANY, CINCINNATI